States that have expanded Medicaid have seen strong gains in coverage and better access to care without having to sacrifice other social programs, new research has found.

But that may not last long.

An analysis by the Kaiser Family Foundation found the 33 states that expanded their Medicaid program to 133% of the poverty line saw a 7.4% decrease in the uninsured rate from 2013 to 2017 compared to a 2.7% drop to those that didn’t.